Impulse sender



H. SENGEJBUCH vImPULsE SENDER Filed Feb. s, 1930'A 4 sheetssneet 1 w 1n. T E25 n ul Q mw u H.. rLu wm. UE. n. f En.. n m m. E Q, m Q s.. Q .T1 NNNN NNN M mw m um@ Q wm @N R Q oww NN @QS m j mw Q gw. mv; N d@ Nm.

' Dec..2l2, 1931 I H. sENGEBUsCH 1,837,236;

IMPULSE SENDER Filed Feb. 3, 1930 4 sheets-sheet 2 oooooooo ooeoocmvol e'ooooooo m oooooooo oooooooo oooooooo N o'oooooeo LL oooooooo ooooooo .Nv f Iem LL. 1 Hans Een abusch H. SJENGEBUsm-a IMPULSESBNDER Filed Feb. 5, 195o 4 sneew-sn'eet 4 IRL/'En .ab Hans Een EbusmZ-L. /l [i Patented' Dec. 22, 1931 UNITED STATES PATENT 'OFFICE HANS SENGEBUSCH, F VILLA PARK, ILLINOIS, ASISIGNOR TO RESERVE HOLDING COM- PANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS IMPULSE SENDER p of impulse senders commonly known to those versed in the telephone art, as operators key senders;I

In semi-automatic telephone systems in which connections -are established between calling subscribers and called subscribers by an operator, it is the usual practice to provide the operator who extends the connection with an impulse sender by means of which she operates the automatic switches employed in that establishment. Most generally that sender is one of the key control type which, for example, is shown and described in the co-pending application of N. H. Saunders and C. E. Lomax, Serial No. 270,198, iiled April 16, 192s.

It can readily be seen that senders of the' `type shown' and described in the just referred to application, require a large number of relays, that number increasing as the number of digits comprising the telephone numbers increase, and that chances for faults to occur are vastly greater in numbers and reliability much less than if simple mechanical means were provided to transmit the series Ef impulses 'comprising the digits of the numers.

It has been assumed, therefore, as the principal object of this invention, the provision of a mechanical impulse sender of the key control type which is simple in its construction, which is exceedingly accurate and reliable in its operation, and in which accurateness and reliability have not been sacrificed for the sake of simplicity.

@ne of the main features of the invention 1s that the means which actually does the limpulsmg is a device which through many years of actual use has proved its reliability.

A device of that character, which is known in the telephone art as a calling device, is

, shown and described in Patent No. 1,642,822,

issued September 20, 1927 to H. F. Obergfell. In the present use of such a device the finger dial has been removed and the shaft of the device is vgeared to a rotatable shaft which takes the place of the Enger dial. l

Other objects and features not specifically mentioned herein, will be apparent from the detailed description of the product of this invention when studied in conjunction with the accompanying' drawings comprisingv Figs. 1 to 7, inclusive, in which:

Fig. 1 is a front view of the impulse sender;

Fig. 2 is a rear view of the im ulse sender;

Fig. 3 is a side view of the legtl side of the iEInpulse sender, with respect to its position in Fig. 4 is a view of the right side of the impulse sender, with respect to its position in Fig. 1, with the upper portion of the sender omitted;

Fig. 5 is a sectional view taken along the section line (5 5) of Fig. 3, looking fromthe right, or the front of the sender, to the left, or the rear of the sender;

Fig. 6 is a sectional'view taken along the line (6 6) of Fig. 3, looking from the left, or vrear of the impulse sender, to theright, or lfront of the impulse sender;

Fig. 7 is a viewl of the impulse-determining or digit-selecting pin board; and

. Fig. 8 is a detailed view of the modification v of the sender start-'controlling mechanism.

In all of these views, the sender has been shown with the cover removed.

Like parts appearing in the several views are designated by like characters of reference. General operation nection requested by a callingisubscriber,

writes the digits of the called number upon the .digit keys 1 to 0, inclusive, depressing one of those keys in accordance with each digit of the number. The operation cf each one of these keys operates one pin in each arcial row of pins in the pin board, shown in Fig. 7, which, as will be described in detail later, controls the olf-normal operation of the calling device 42. v

When the number has been 'completely written upon the digit keys, the operator then depresses the start key which completes the circuit of motor 12. Motor 12 commences to run when its circuit is completed and, through the medium of gears, turns the calling device 42 in its off-normal operation for each digit of the number. The extent of off-normal operation of the dial is controlled through the pin board which causes the release of the calling device from the control of the motor to allow the calling device to return to itsnormal position to transmit impulses in the usual manner. When the calling device reaches its normal position, it is again put under control of the motor 12 and is again rotated in its oif-normal movement.

The number of olf-normal movements and consequent return-to-normal movements of the dial 42 corresponds to the number of keys depressed or the number of digits in the telephone number which it is desired to transmit in series of impulses to operate the automatic switches in the 'well-known manner. When all impulse series have been transmitted, operations are performed to release the start key and to thereby open the motor circuit and to `return the pin board and the pins operated therein to their normal positions, so that the sender shall be in readiness to transmit series of impulses corresponding to a second telephone number which the operator may desire to write upon the digit keys.

Detailed construction and operation The base plate 1 is supported at each of its corners by the rubber feet 4 which are secured to the base plate by means of screws in a well-known manner. A front mounting plate 2 and' the rear mounting plate 3 are maintained in space relation with each other by means of the cross brace 5, Fig. 3, and the crossbrace 6, Fig. 4, and grooves in the base plate 1 into which the lower edges of the mounting plates 2 and 3 fit. The mounting plates 2 and 3 are secured to the .cross braces 'and to the base plate 1 by means of screws.

A rear mounting plate 3 has an aperture 3, Fig. 6, which is of such a size as to receive the motor 12 and to form a tight fit for the casing of the motor. The shaft of the motor, which is not visible in the drawing, operates a r'eduction gear train which is enclosed in the gear housing 14, Fig. 3. A rod 13, Fig.- 3, is secured at one of its ends touthe gear housing 14 and is tapped in its other end to receive the screw 15 which is inserted through a h ole in the front mounting plate and thus serves as a support for the other end of the motor.

A shaft 16 which is journaled at its ends in the mounting plates 2 and 3, is held in the journals by means of the collar 17, Fig. 3, and the collar 18 best seen in-Fig. 5. The shaft 16 extends through the mounting plate 2 for a distance sulicient to receive the hub 19 which is secured to the shaft 16 by means of a set screw.

The hub 19 carries the spider wheel having the arms 20, 21, 22, and 23.

A bracket 43, Fig. 1, is secured to the front of the front mounting plate 2 and supports contact spring 30 and 31 in such spring 31, allowing that spring to separate from spring 30. .This clockwise motion of member 24 is caused by the arm 21 of the spider wheel. The counter-clockwise motion of member 24 to the position in which it is shown in Fig. 1 is caused by the arm 22 of the spider wheel.

A plurality of keys similar to typewriter keys are provided and are desi ated by numerals 1 to 0, inclusive, and tart and Error. The horizontal arms of 'these keys project through the vertical slots 38 in the front mounting plate 2 and extend toward the rear of the sender, where, at their rounded ends, they are pivotly mounted upon the shaft 45.

The shaft 45 is mounted in a block 44 secured to the base plate 1, which block has a series of vertical slots which receive the ends of the horizontal arms of the keys. These slots are slightly wider than the horizontal arms of the keys are thick so as to allow rotary motion of the arms about the shaft 45, but narrow enough to prevent any lateral motion of the arms. The material of the blocks between the slots serves to hold the keys in spaced relation with each other. This mounting arrangement of the horizontal arms of the keys is best seen in Figs. 3, 4, and 6.

A spring 7, Fig. 1, is provided for each of the digit keys, 1 to 0, inclusive. Each springr is secured at one of its ends to the horizontal arm of a key and at its upper end to the rod 8. 'These springs 7 hold the digit keys against the upper end of the slots 38 in the plate 2 and serve to restore the digit keys to that position when they are released after having been depressed.

The bar 8 at its left end is secured to the front plate 2 by means of screw 9 and at its right end is bent to fit into a small aperture in the plate 2. The spring 10 serves to restoritthe error key to its normalposition whenreleased after having been depressed and is a stronger spring than the spring 7 since more influence must be exerted upon the error key to return it to its normal position as will be understood later.

39"thereof are in position to block all except a slight downward movement of all of the keys except the start key, which key is prevented from any downward movement by means which will be described subsequently. When the bar 35 is moved to the right the teeth 39' are moved out of interfering relation with the keys and the kslots 39 are in cooperating position with the slots 38 in the plate 2 to allow complete downward movement of the keys. 1

It will be noted that the tooth 39 which blocks the motion of the 0 digit key is wider than the others and is provided with the slanting edge 40. The start key'when depressed, engages the edge 40 and slides the bar 35 to the left to place the teeth 39 in interferingkposition with the digit keys to prevent operation thereof while the start lkey is in its operated, or depressed, position.

rllhe lever 32 is pivotedv at 3 3 on the front plate 2 and at its lower end is provided with a slot which cooperates with the pin 34 of the plate 35 and serves when the upper end is pressed downward to 'move the plate 35 to the left to place the teeth 39 into position to lock the keys from operation. Lever 32 may be locked in its operated position,

that is, after it has been pressed, 1n any suita-ble manner to maintain the keys locked from operation. AWhen the lever 32 is released, the spring 33 restores the lever and moves the slidable bar to the left to unlock the keys.

.In cases where this sender is used with small private branch exchange systems and the attendant is provided with a telephone instrument instead of an operators headset, the instrument of the hand o'r cradle type could be used and employed as the means for locking the lever 32 in position to prevent operation of the digit keys. In that arrangement, removal of the instrument from the cradle would allow the spring 33 to restore the lever and remove the blocking teeth 39 from underthe digit keys.

The pin board best seen in Fig. 7 is of a hollow'or box-like construction and is made from the two plates 49 and 50 and the separating member 51. Each `of the'plates49 and 50 is provided with eight arcial rows of tenholes, the holes in plate 49 being in cooperative relation with the holes in plate 50 so that pins inserted in the corresponding holes of the two plates may protrude on both sides of the box-like construction. f

Each of the pins inserted in these holes has 05 a shoulder mid-waybetween extremities,

which, when the pin isin position, is enclosed in the box-like construction between the plates 49 and 50 so that if the pin were pressed at one of its ends it would slide in the holes until that shoulder engages onelof the plates. In this manner, pins may be pushed upon either of their ends and still be retained in the holes. The pins are of such a length that the ends upon which pressure is exerted to push them will be substantially flush with the surface of the plate. If one of the pins in the face view of the pin board were pressed inward toward the plate 49, the end which is visible would be substantially flush with plate 49.

As can be seen, the member 51 is shorter in 1length than either of the members 49 or 50.

By this arrangement, a trough is provided at .either end of the pin board so that the pin board can be moved upward'and downward on the shaft 54, Fig. 3, and the shaft 55, Fig. 4, which shafts are so positioned as to 'fit within the troughs. The right end of the pin board, with respect to its position in Fig. 7, is provided with two members 52 each having a hole therein to receive the shaft 55 .to

'form a sliding bearing for the pin board.

Within the trough at the opposite end of the pin board, two pieces 56 secured to the plates 49 and 5() within the trough, form a sliding surface forfshaft 54 to prevent rotation of the pin `board about the shaft 55.

rlhe right end of the plate 49 is bent forward to form the projecting piece 53 which along its front edge is cut to form ratchet teeth by means of which, when pawl 57 is operated as will be explained, the pin board is moved upward along the shafts 54 and'55 in a step-by-step motion. These teeth are so spaced that motion of the pin board upward the space of one tooth will equal in extent the distance between two arcial row of pins.

The shaft 54 is secured at its lower endv in the base plate 1 and at its upper endin apiece secured to the cross brace 5, while the shaft 55 is secured at its lower end in the base plate 1 and at its upper end in a piece secured to t-he cross brace 6.

A bracket having a horizontal piece 58 extending under alll of the horizontal arms of the digit keys l to 0, inclusivefand having two side arms 58, Fig. 3, and 59 similar to 58 and seen in cross section in Fig. 6, has the ends of these arms rotatably mounted on the shaft 45 as are the horizontal arms of the digit keys'. Each depression of one of th e digit keys 1 to 0, inclusive, causes the horlzontal arm of that digit key to engage the horizontal cross piece 58 of the bracket to carry that bracket downwardl with its own downward movement. When the key is released and returned to its normal position by ing the side arms 58 and 59 and the horizontal cross piece 58', returns the bracket to the position` from which it was moved by the depression of the digit keys.

The pawl 57 is rotatably mounted on the side arm 59 of the bracket and is held into engagement with the teeth of the ratchet 53 by means of spring 60. Thus it can be seen that with each downward movement of the bracket consequent to a depression of a digit key, the pawl 57 is moved downward'. That downward movement is sutlicient to move pawl 57 into engagement with the tooth of the ratchet 53 below the one with which it was in engagement before the downward movement started.

The return of the bracket under the influence of spring 11, causes the pin board to be lifted the space of one'tooth. Thus, for every depression of a digit ke thegpin board is elevated one step, the distance' of that step being the distance between arcial rows of pins as previously pointed out.

A holding pawl 61 is rotatably mounted intermediate its extremities at 62 on the cross brace 6 and has a projecting piece 61 which engages a tooth of the ratchet 53 to hold the pin board in position during the downward movements of pawl 57. Pawl 61 `is held in operative relation with ratchet 53 by means of coil spring 63. i i

The pin board is in its normal position when it is resting upon the blocks 64 and 65, in which position it is in readiness to be elevated step-by-step by the depressionsof the digit keys.

Each of the horizontal arms of the digit keys 1 to 0', inclusive, has an upwardly projecting arm 66 which in turn khas the forwardly projecting piece 67x These arms 66 are o Varying lengths so that Vthe ends 67 form an arcial row, the radius of curvature of which is equal to that of the arcial rows of pins in the pin board. The distance Ibetween two arms 66, and consequently the ends 67, is equal to the distance between two pins in an arcial row, or as may be seen in Fig. 7, the distance betw'een two vertical' rows of pins, each vertical row comprising a pin of each arcial row. Each end 67 is positioned in relative position-with one of the vertical rows of pins., for example, the end 67 of the digit key No. 1 is lin relative position with the left end vertical row of pins, the end 67 ofthe digit key No. 2 isin relative position with the second .from the left vertical row of pins, end 67 lof 'digit key No. 3 is in relative position with the third from the left vertical row of pins, etc. When the pin board is in its normal position, each end 67 is in operative relation with'the first or upper-most pin in its4 associated vertical row. L

The depression of'digit key No. 1, for example, causes the rotation of its arms about shaft 45, thereby moving the end 67 into engagement with the uppermost pin in the associated vertical row and thus pushing the end of the pin toward the plate of the pin board. This movement of the pin causes the other end to protrude farther from the surface of the plate 49, in which position it keys will, in a like manner, move the corresponding` pin in the second arcial row to a position, with respect to the plate 49, corresponding to that into which the first pin was moved, and will cause the elevation of the pin board another step to place the pins ofthe third from the top arcial row of pins in operative relation with the ends 67 of the digit keys.

Since there `are eight arcial rows of keys, after the depression of eight digit keys, there will be one pin in each arcial row in the Av`osition corresponding lto 'that into which the pins of the first two arcial rows were moved, which position hereinafter will be termed the operated position of a pin. Since there are eight'arcial rows of pins, the sender is capable of transmitting eight consecutive series of impulses as will-.be clearly evident as the Adescription progresses.

The start key is also provided with an upwardly projecting arm designated in Figs. 4. and 6 by reference numeral 69, which projecting arm has been rearwardly bent to form the part 7 0 which carries the projecting piece 72. The rearwardly extending portion 70 of the arm 69 carries the roller bushyare insulated from each other, which assembly is secured to the rearward mounting plate 3 by means of screws 85 and 86. The metal piece 84 which is included as a part of the spring assembly and which is located between the contact: springs 77 and 78 forms a stop for the spring 77 to insure separation of the contact springs when they are allowed to disengage each other as will be explained subsequently.

A U-shaped holding pawl having the two arms 73 and 7 3 is rotatably mounted on the cross brace 6, with one arm on either side of the cross brace, by means of the pin 7 4 which extends through the cross brace 6. A leaf y 72 of the start key as best seen Iin Fig. 4.

Since the start key is pivoted upon the shaft 45, depression of the start key' will rotate the projecting arm 69 to move the projecting piece 72 towards the front of the sender. Since contact spring 78 engages the roller 71, rotation of the arm 69 pushes the contact spring into engagement with Contact spring 77. Continued movement of the arm 69 causes spring 77 to-disengage the piece Ain writing the number upon the digit keys,

the error key has been provided to allow her to restore the pin board andthe operated pins therein to their normal positions. The error key has the arm 68 which moves to- Ward the front of th'e sender when the key isdepressed and engages the projecting piece 83 of the pawl 61 to move the holding portion 61 thereof and the operating pawl 57 out of engagement with the teeth of ratchet 53 to allow the pin board to drop t its nor- 84 and the piece 72 to assume a position back m31 Position- This Tetllrn'tonomal move' of the shoulder of the pawl 73. Inthis position, the piece 72 will move backward to engage the shoulder of the pawl 73 when pressure is removed from the start key and Will thereby hold the start key in its operated position to maintain thesprings 77 and 78 in engagement'with each other. Springs 77 and 78 are included inthe circuit of the motor 12 and when moved linto engagement with each other, close the circuit for the motor.

The purpose of the arm 73 will be eX- plained later.

A second U-shaped pawl arrangement having the arms 79 and 80 is rotatably mounted on the arm 69 of the start key at 81. When the pin board is in its normal position, the arm 79 abuts a projecting piece on the plate of the pin board to prevent depression of the start key. -When the pin board has been elevated a step consequent to the depressionof one of the digit keys, the arms 79 will no longer abut the projecting piece of the plate 50, so that the operation of the start key is noW permissible.

The free end of the yarm 8() has a piece cut out of the upper edge thereof to form a step which is adapted upon movement of the start key to engage the projecting piece 83 yof the holding p awl 61. `'Ihe free end of the arm 80 is held against the under edge of the projecting piece 83 by means of the coil spring 82 attached to the member' 69 and to the end of the U-member comprising arms 79 and 8() on the other side of the pivot 81.

From this arrangement it can be seen that after the pin board has been elevated, depression of the start key not only closes the circuit of the motor 12 by moving springs 77 and 7 8 into engagement with each other,`but also I noves the holding portion 61 of pawl 61 and the operating pawl 57 which is engaged by the portion 61, out of engagement with the teeth of ratchet 53 to permit the pin board to ldrop toyits normal position for a purpose which will be understood laten When the fst-art key is released, the inovement of the arm 69 in the reverse direction ment of the pin board, however, does not restore the pins to their normal positions.

The description of the pin-restoring mechanism, about to be given, will best be understood by referring to F igs.v 3 and /5. A mounting bracket 95 secured to the rear side of the front mounting plate carries a rod 94 slidably mounted in the mounting bracket 95. This rod 94, at its left end, Fig. 3, carries a pin restoring plate 99 which has sulicient surface to cover all of the pins in the pin board. lWhen rod 94 is moved to the left from its position in Fig. 3, the pin-restoring plate 99 engages those pins which are in their operated positions `and pushes them into the pin board into the position from` dium of the slot and the pin 98 moves the rod 94 to the left to perform the pin-restoring operation. A coil spring about the rod 94 and between the 4end of the bracket 95 and the pin 98 exertsopressure to restore the rod 94 and the pin-restoring plate to the position shown in the drawings.

A lever 87, which is pivoted 'at one of the ends by screw 88 which is secured in the front mounting plate 2, has al U-shaped bend intermediate its ends to t around-the mechanism comprising thebracket 95, the rod 94 and the angular lever 96. This lever 87 has an extension forming the pinY 100 which tits in the slot in the other arm of the angular bracket 96. When thefree end of the lever' the arm 92, it engages the pin 102 w When the free end of the lever 87 is re` leased, the spring on the rod 94 not only restores that rod to its normal position but also through the reverse rotation of the angular lever 96 restores the lever 87 with the aid of gravity to the position in which that lever is shown in Fig. 5.

The pin-restoring plate 99 near its lower edge carries the pin 101 which slides 1n a hole in the lower art of the bracket 95 to prevent rotation o the rod 94.

A pawl member having the three arms 90, 91, and 92 is rotatably mounted at the hub of these three arms to the free end of lever 87 by means of the screw 89. A coil spring 93, secured at one of its ends to the end of arm 90 and at its other end to the lever 87, holds the arm 92 against the horizontal arm of the error key. The arm 92 near its lower extremity is provided with a shoulder, which, when the error key is depressed, slides over the upper surface of the horizontal arm of the error key so that when the error key is released and returned to its normal position under the iniiuence of the coil spring 10, the pawl member of which the arm 92 is a art, and consequently the free end of the ever to which this member is fastened, is lifted by the horizontal arm of the error key. V

This lifting of the free end of the lever 87 performs the pin-restoring operation just described.

As the arm 91 moves upward along l ich is secured in the front mounting plate 2 and rotates the pawl member about its axis against the tension of spring 93, thereby moving the shoulder of the arm 92 out of engagement with the horizontal arm of the error key. rlhe pawl member and the lever 87 are now free to be returned to their normal positions under the influence of gravity and under the influence of the spring about the rod 94. Thus, an operation of the error key not only restores the pin board to its normal position, but also operates the pin-restoring mechanism to restore the operated pins to their normal positions.

The hub 17, Fig. 6, which is secured to the shaft 16 by means of a set screw and which serves as a collar to prevent lateral motion of the shaft 16 in its bearings inthe platesl 3 and 2, carries the gear segment 103 which -meshes with the gear 104 mounted on the shaft of the calling device 42. From a description of the operation and construction of the calling device 42 which can be had by reference to the afore-mentioned Obergfell patent, it can be seen that rotation of the gear 104 in a clockwise direction by the rotation of the gear segment 103 in a counterclockwise direction stores up tension in the restoring spring about the shaft of the calling device. This stored up tension, as will be with understood better as the description progresses, is utilized toreturn the gear segment 103 to the position in which it is shown in the drawings when that gear segment is released, by rotating the gear 104 in a counterclockwise direction. Since gear segment 103 is rigidly secured to shaft 16, any rotation of shaft 16 moves the gear segment and any movement of the gear segment rotates the shaft 16.

When the ear segment 103 is rotated in a countercloc wise direction the full extent of 'its motion, that is, until the right-hand edge abuts the under side of the cross brace 6, the free end of the piece 105 which is secured to the gear segment 103 asses to the right of the end 107 of ythe leai) spring 106 which is secured to the rear mounting plate 3. A slight reverse movement of the gear segment 103 will cause the free end of the piece 105 to abut the end 107 of spring 106' to prevent the return-to-normal movement of the gear segment 103 for a purpose which will be described later.

The immediately following description will best be understood by referring to Figs. 1, 3, and 5, and particularly to Figs. 3 and 5.

A spool-shaped member 112 having the end 113, which is knurled about its periphery and the end 116, has its aXle 114 rigidl secured at its end to the rear side of the ront mounting plate 2 by means of the screw 114 inserted through the plate 2 and screwed into the axle 114. The end 113 of the spool 112' near its periphery carries the sto pin 115. A push rod 118 is excentricaly attached to the end 116 of the spool 112 by means of the pivot screw 117. Rotation of the spool 112 transmits a vertical reciprocating motion to the push rod 118.

The push rod 118, near its free end, is provided with a shoulder 120. The free end of the push rod 118 is inserted through a hole in the cross arm 58 of the pin board elevating bracket and in a hole in the base plate 1. Downward movement of the push rod 118 caused by the excentric action between the end 116 of spool 112 and the pivot screw 117 upon the rotation of spool 112, causes the shoulder 117 to engage the cross arm 58 and push the cross arm downward as was done by the operation of one of the digit keys as described, to move the operating pawl 57 into engagement with another tooth preparatory to the elevation of the pin board one step upon the return-to-normal movement of the bracket under the influence of s ring 11 as described. The push rod 118 wille returned to its normal position, that is, to the position in which it is shown in Fig. 5, by the continued eXcentric movement of the end 116 and the pivot screw 117. Thus it can be seen that each revolution of the spool 112, and consequently vthe end 116, operates the pin board elevating bracket, comprising the cross arm 58 and the two side arms 58 and 59, to elevate the pin board one step for each of those revolutions.

The free end of the push rod 118 below the shoulder 120 has been made long enough so that that end will remain inserted in the hole in the cross arm 58 when the cross arm 58 is moved downward under'the action of the horizontal arms of the digit keys.

A holding pawl 121, having the side projecting pieces 121 and 125, is rotatably mounted on the rear side of thefront mounting plate 2 at 123. The side projecting piece 125 extends through an aperture in the front mounting plate 2 and the end 124 of the holding pawl 121 abuts the side of the aperture and is normally held against that side by' means of the leaf spring 122 which at one of its ends is secured to the paw 121 and which at its other end bears against the cross brace 5. When the holding pawl 121 is in this position, the pin 115 carried by the end 113 of spool 112-'engages the under side of the side projecting piece 121. Downward pull exerted upon the push rod 118 by the coil spring 119 holds the pin 115 against the side projecting piece 121 to prevent any rotation of the spool 112. When the pawl 121 is rotated in a clockwise direction, with respect to its position in Fig. 5, against spring 122, the side projecting piece 121 is moved out of engagement with the pin 115.

The downward pull exerted on the push rod 118 by the spring 119 causes the spool to be rotated through an angle suiicientto place the pin 115 in such position that when the pawl 121 is returned toits normal position under the inliuence of spring 122, the pin 115 will be free of the side projecting piece 121. The amount of rotation of the spool 112 under iniuence of rod 118 and spring 119 is governed in a manner which willy be explalned subsequently.

Rotatably mounted uponlthe shaft 16 between the collars 18 and 130 iusjay spool-like member 126, one of whose ends carries the gear teeth 127 and the other of whose ends carries the ratchet teeth 128. The central or hub portion of the spool 126 carries the rubber tire 129. By means of the gear teeth 127, and gears 140 and 141 which are mounted upon the same hub on axle 142 secured to the front mounting plate 2, and by means of the pinion gear 143 which comprises a part of the reduction geaiV train enclosed in the gear housing 14, the spool 126 is rotated in a clockwise direction about the shaft 16 by the motor 12.

The end 113 of the spool 112 is provided with a flat side, which when the spool is in its normal position as shown in Fig. 5, the llat spool 112 is in operative relation with the rubber tire 129 carried by the spool 126.

Because the flat side of the end 113, which fiat side is shown b the dotted line in Fig. 5, is adjacent the rubbei-tire 129, the spool 126 will rotate without any influence upon the spool 112. When the spool 112 is rotated through the slight angle under the influence of the connecting rod 118 and spring 119 upon the disengagement of the pin 115 and the side projecting piece 121 as explained, the flat side of the end 113 is moved out of its adjacent position with the rubber tire 129 and the knurled periphery of the end 113 is moved e .ment of the knurled portion of end 113 with the rubber tire 129 will cause the spool 112 to berotated about axle 114 by the spool 126 in a counter-clockwise direction.

This rotation of the .spool 112 will move the push rod 118 downward to perform the pinboard lifting operation as described, and the rotation will continue until the pin 115 again engages the side projecting piece 121.', which engagement will occur when the iiat side of the end piece 113 is again adjacent the rubber tire 129.

The collar, or hub, 130 has as a rigid vpart thereof, the pawl carrying member 131 which carries at its free end the pawl 133 which is rotatably mounted thereon by means of the pin 134. Pawl 133 has the pin engaging arm 138, the ratchet tooth engaging arm 139, and the operating arm 137. By means of the arm 135 of the pawl 133 and the leaf spring 136 secured to the pawl-carrying member 131, enough friction is generated to hold the pawl in whichever position it assumes when moved.

, of spool 112 when the spool 112 is rotated by the spool 126.

En agement of the operating arm 137 and the p1n 115 rotates the pawl 133 in a clockwise direction, with respect to its position in Fig. 5, about its axis 134 to move the ratchet tooth engaging end 139 into engagement with a tooth of the-ratchet teeth 128 carried by the `spool 126. In the normal position of the pawl 133, the arm 139 is out of engagement with the ratchet teeth 128.

Rotation of the spool 126 when the arm 139 of pawl 133 is in engagement with ratchet teeth 128 carries the pawl 133' and the pawlcarrying member 131 with it. Since the member 131 is a part ofthe hub or collar 130 which is` secured rigidly'to the shaft 16, the

` pawl 133 when the pin board is elevated one step, and each time the pin board is elevated `a step another arcial row of pins is placed in the path of the pin-engaging arm 138. On the first movement of the pawl 133 with the spool 126, which occurs after the pin board has been elevated a step from its normal position, if a pin in the first or upper-most arcial row is in its operated position, the pin-engaging arm 138 will engage that pin and cause the pawl 133 to be rotated in a counter-clockwise direction about its p-ivot 134 to move the arm 139 out of engagement with the ratchet teeth 128.- When the pawl 133 and the pawl-carrying arm 139 are thus released from the movement of spool 126` they will be returned to their normal position by the counter-clockwise rotation of the shaft 16, with respect to its position in Fig. 5, under the action of the restoring spring on the shaft of the calling device through the medium of gear 104'and gear segment 103.

This cycle of operation is as follows, assuming the motor to be running and consequently the spool 126 to be rot-ating: The pawl 121 is rotated to free the pin 115 to allow the spring 119 to move the spool 112 to place it under control of spool 126. Spool 112 is then rotated by the spool 126 to move the push rod, and consequently the bracket of which cross arm 58 is a part, downward and to cause the pin 115 to engage the operating arm 137 of the pawl 133 to rotate the pawl and place the arm 139 thereof in engagement with the ratchet teeth 128. By thetime this takes place, the downward movement of push rod 118 has been completed and the pin board elevating bracket through the medium of the operatingpawl 57 and the spring 11 elevates the pin' board one step to place the first arcial row of pins, or correctly, the piny thereof in its operated position inthe path of the pin-engaging arm 138; of the pawl 133. By this time, the movement of the pawl 133 and the rotation of the shaft 16 under the influence of spool 126 has commenced. This movement will continue until the arm 138 engages the pin in the first. arcial row which is in its operated position, at which time the release of the pawl 133 and consequently the shaft 16 from the control of the spool 126 takes place. Then the .return-tonormal movement ,of the shaftv 16 and consequently the pawl 133 under the influence of the restoring spring in the dial commences.

Since the gear 104 is attached to the shaft r `of the calling device 42, the return-to-normal assume its normal position. The pins in each arcial row in the pin board are so positioned that if the first pin were moved to its operated position the rotation of the shaft 16 under the influence of the spool 126, the extent of which movement is governed by the distance through which the pin-engaging arm must travel before it engages a pin of the pin board in its operated posltion tc release the pawl 133 and consequently the shaft 16 from the influence of spool 126, is of such an extent that, in its return-to-norma] movement under the iniiuence of restoring spring of the calling device, the calling device will operate its impulse springs once to transmit one impulse. In a like manner, if the tenth or last pin in the first arcial row were moved to its operated position instead of the first pin, the shaft 16 would be rotated to such an extent before itV was released that in its return-to-normal movement, the calling device 42 operates its impulse springs ten times to transmit ten impulses. The remaining pins of the row intermediate the first and tenth pins are so spaced to govern the offnormal rotation of the shaft 16 that the return-to-normal movement thereof causes the calling device 42 to transmit a number of impulses in accordance with the number of the pin in the row, which was moved to its operated position.

If the pawl 121 is again moved after the pawl 133 has returned to its normal position, the same cycle of operations will again be performed. This time, however, the pinengaging arm 138 will engage the operated pin in the second arcial row and for each successive operation will engage the pin in the succeeding row.

Since there are only eight arcial rows of pins, after the elevation of the pin board another step consequent to the release of the spool 112 by the operation of the pawl 121 'after the eighthvreturn-to-normal movement of the pawl 133, the pins in the pin board will all be above the path of the pin-engaging arm 138. Consequently, since there is no pin in the path of the arm 138 to cause the release of the arm 139 of the pawl 133 from the ratchet piece 128, the pawl 133 and the member 131 will be carried along with the Spool 126until the pin-engaging arm 138 has moved entirely past the pin board and engages the pin 144 secured in the front mounting plate 2.

When the arm 138 of pawl 133 engages the stop pin 144, the pawl 133 is rotated to disengage itsY arm 139 from the ratchet piece 128 to free the shaft 16 from the control of' spool 126 in the same manner as was done when the arm 138 engaged an operated pin in the pin board.

This last rotation of Shaft 16 whenpawl 133 is sweptpast the pin board moves the gear segment 103 to such an extent that the free end of the piece 105 attachedthereto moves past the end 107 of spring 106. Return-to-normal movement of the shaft 16 is prevented after it is released by the engagement of the free end of piece 105 with the end 107 of lspring 106 when the return-tonormal movement of the shaft 16 has just started. f

, When gear segment 103 moves as has just been described, the right edge thereof, with respect to its position in Fig. V6, engages the arm 73 of the U-shaped holding pawl and carries thearm 73 with it to free the projecting end 72'of the start key from the arm 73 of the pawl. This release of projecting end 72'al1ows springs 77 and 78 to disengage each other under their own tension and, through the pressure of spring 78fupon the roller 71, causes the restoration of the start key to its normal position.

When the shaft 16 is rotated in this last movement, the arm 23 of the spider wheel attached to the end of shaft 16 in front of the as a part of the holding pawl 61 to assume a` position iin backof the cross brace-6, Fig. 4. Arm. 62 when engaged and moved ,by the arm 23 of thenspider wheel rotates thegpawl '61 in'a clockwise directionabout its axis 62,

with respect to its position in Fig. 4, to move the piece 61 thereof and the operating pawl 57 out of engagement with the ratchet 53 to allow thepin board to drop to its `normal position'. V

When the arm 23 engages the arm 62 upon' this last rotation of the shaft 16, the a'rm 22 of the spider wheel engages the liber piece 24 and moves it to move the v"contact spring 31 into engagement with contact'spng 30. Whengthe sender is connected in circuit Aand wired up, the contact springs 30 and 31 will be so Wired as to place a shunt, when in engagem'ent with each other, about the impulse springs of the callingdevice 42 for the purpose of preventing the calling device transmittingjany impulses upon the '.return-to-nor-I mal movement of the shaft 16 after this last rotary movement thereof.

A lever 26 pivoted at 27 so as to rotate in rubbing contact with the'front side of the front mounting plate 2 has formed as a part thereof the stop piece ,28 which serves as a A back stop for the arm 23 of the spider wheel. The free end of the lever 26 is connected to the start key by means of the connecting rod 29 so that vwhen the start key is depressed the lever 26 will be rotated about its pivot 27 to move the stop piece 28 out of engagement with arm 23.- When the start key returns to normal, the lever 26 is returned to the position in which it is shown in Fig. 1. A T-shaped lever having the vertical arm 108 and the two horizontal arms 109`and 110 is rotatably mounted in the arm 109 near the junction of the three arms, upon the shaft 45 in such position that when the pin `board returns to its normal posit-ion it engages the arm 109 and rotates the T-shaped lever -through an angle sufficient to cause tlfe arm 108 to move the spring 106 and thereby free the piece 105 on the gear segment 103 from the end 107 of spring 106. The largest portion of the Weight of the T-shaped lever is so located that when the 'in board is elevated and the end 109 release the lever will rotate of its oWn accord until the arm 110 engages the stop screw 111.

When the piece 105 is thus released the shaft 16 will return-tonorma1 under the influence of the restoring spring about the shaft of the calling device. This return-to-normal movement of the vshaft 16 has been delayed until theA pin board has been returned to normal' because, if the shaft 16 and consequently the pawl 133 were to return to normal while the pin board is dropping to its normal position, the in-engaging arm 138 of the pawl would likely encounter one of the operated pins which has not as yet been returned to normal and prevent the complete restoring to normal'of the sender.

Since the start key is released before the shaft 16 starts this last return-to-normal movement, the stop piece 28 carried by the lever 26 will be in position to engage the arm -23 of the spider wheel to stop the shaft 16 in yits normal osition.

The sha t 16 and the s ider Wheel attached thereto are provide with an initial off-normal movement which is the reverse ofthe off-normalmovement of the calling device 42 preparatoryl to the impulse transmitting operation for a purpose which will y now be described.

When the start key'is depressed after the i is determined by a stop in the calling device, to cause the arm 21 of the spider wheel to move the lever piece 24 out of engagement with contact spring 31 to disengage contact springs 31 and 30 to remove the shunt from about the impulse springs of the calling device 42, .and to move the arm 20 which -in moving engages the part 125 of the holding pawl 121 to move the side projecting piece 121 of the pawl out of engagement with the pin 115 secured'in the end 113 of spool 112 preparatory to starting the operation of the sender as has been described. Upon each return-to-normal movement of the shaft 16 after the shaft has been released from the control of spool 126 by the engagement of the pin-engaging arm 138 with'an operated pin in the pin board, the shaft 16 and the spider wheel will pass through the normal position since the lever 26 and the piece 28 thereof are held down because of the locking of the start key in its operated position. In this manner, after the transmission of a series of impulses corresponding to a digit of the number Written upon the digit keys, the arm 20 of the spider wheel is caused to again operate the pawl 121 through its arm 125 to cause the sender to operate to transmit a series of impulses corresponding to the succeeding digits of the number. Thus it can be seen that when the arm 23 engages the piece 28 in its normal position, the arm 2O is stopped before it can operate the pawl 121.

In order that the operated pins of the pin board might be restored to their normal positions after the sender has been operated as described to transmit the series of impulses, the collar 18, Fig. 5, has been provided with a shoulder 18 and a lifting lever 146 has been rotatably secured to the lever 87 by means of a screw 147. When the shaft 16 is rotated by the spool 126 far enough so that the pin-engaging arm 138 will engage'the stop pin 144 and only when the shaft 16 is rotated this far, the shoulder 18 engages the hook portion of the lifting lever 146 and lifts that'lever and consequently the lever 87 to perform the pinrestoring operation as described, when the shaft 16 performs its last return-to-normal movement.` When the shaft 16 nears its normal position, the shoulder 18 will slide out of engagement with the lever 146. which levern will return to the position in which it is shown in Fig. 5, when the shaft 87 is restored to its normal position. The coil spring 148 holds the free end of the lever 146 against the surface of the collar 18.

A modification of the startl control mechanism operated by the start key is shown in Fig. 8, in which figure the primed numerals designate parts corresponding to similar parts in the preferred embodiment just described. In this modification, the initial offnormal movement of the shaft 16 and the spider wheel is eliminated. The lever 26 instead of being pivoted at one of its ends is centrally pivoted at 27 on the front mounting plate 2 andis controlled by the start key through the connecting rod 29 in the manner similar to that in which lever 26 is controlled by the start key.

When the start key is depressed to start the impulse transmission, the free end of the lever 26 is rotated out of engagement with the dog 152 to allow the knurledl edge of the end 113 of the spool 112 to engage the rubber tire 129 carried by the spool 126. The pin 115 carried by the end of the spool 113 engages the operating arm 137 of the pawl 133 as before and shaft 16' and the spider wheel are rotated as before. AThis rotation of the spider wheel moves the arm 20 out of engagement with the projecting piece 125' of the holding pawl 121 which pawl is pivoted to the front mounting plate 2 at 149. Under the influence of spring 153 the pawl 121 will rotate about its pivot 149 until the end 124 of the pawl engages the side of the aperture in the front plate 2 which side is represented as the stop pin numbered 154. This rotation of pawl 121' moves the hooked arm 150 into position to engage the pin 115 to arrest the rotation of the spool 112 when the Hat side thereof is adjacent the rubber tire on the spool 126.

It will be noted that in the normal position of the spider wheel in Fig. 8, the arm 20 is in engagement with the end 125 of the pawl holding that end away from the stop pin 154. Therefore, when the shaft 16 returns to its normal position, the arm 20 en gages the end 125 of the pawl, rotating the pawl and moving the arm 150 to free the pin 115. This operation takes place each time the shaft 16 and the spider wheel have returned to their normal position.`

lVhen the start key is released as described upon the last rotation of shaft 16, the lever 26 assumes the position shown. Now, when the spider wheel returns to normal and the arm 20 moves the arm 150 of the pawl out of engagement with the pin 115', the spool 112 will rotate through a very slight angle until the dog 152 engages the free end of the lever 26. This slight rotation of spool 112 is'suflicient to move the pin 115 so that when the pawl 121 is rotated under the iniuence of spring 153, the arm 150 of the pawl will not engage the pin 115. This rotation of spool 112, however,

is not sufiicient to place the knurled edge of the end 113 of spool 112 in operative relation with the rubber tire 129. Arm 21 is used to operate the fiber member 24 from its normal position, arm 22 as before is used to move the ber member 24 back to its normal position, in which position it causes engagementl between the contact springs 30 and 31, and arm 23 'engages the arm 62" of the holding awl 61 to release the pin board as before escribed.

5 Summmg/ of detailed operatz'mt start key. The start. key closes the cir.

cuit of motor 12 by forcing the contact spring 78 into enga ement with the contact spring 77, and is loc ed in its operated position by the engagement of the end 72 of the start key-with the holding pawl 73.

As each digit key is depressed one of the pins in eacharcial row is moved to its operated position and the pin board is elevated one step.

The pin board is restored to its normal position through the actionof the arm 80 of the U-shapedpawl attached to the arm 69 of the start key forcing the portion 62 of `the holding pawl 61 and the operating pawl 57 out of engagement with the teeth of ratchet 53 carried by the pin board.

Y Simultaneous with this release of the pin board the arm 23 ofthe spiderwheel is released and the shaft 16 and the spider wheel are rotated in their ihitial off-normal move- .ment by means of the., restoring spring of the calling device 42 through the medium of gear segment 103 'and gear 104. This initial ofinormal movement causes the arm 20 of the spider wheel to move the pawl 121 to free the spool 112 so that the knurled edge ofthe end 113 can be moved into engagement with the rubberv tire 129 carried by the spool 126, under the influence of the push rod 118 and spring 119. i

Spool 112 immediately begins to rotate Vwith the spool 126 and the push rod 118 operates the pin board elevating bracket comprising the side arms 58 and 59 and the cross piece 58', to elevate the pin board one step to thereby place the first arcial row of pins in the path of the pin-engaging arm 138 of the pawl 133 so that the operated pin in that row will be in position to be engaged by the arm 138. nThe rotation of spool 112 causes the pin 115 carried by the end 113 to engage the operating arm 137 of pawl 133 to rotate' the pawl about its pivot 134 to move the arm 139 into engagement with the ratchet teeth 128 of spool 126. Pawl 133 immediately begins to move with the spool 126 and by means of the arm 131 causes the Arotation of shaft v16 with the spool 126. v Y p Spool 112 continues its rotation until the pin 115 engaged the projecting arm 121 of the pawl 121.

This movement of pawl 133 continues un.-

, -til the pin-'engaging arm .138 engages the o operated pin in the4 first "arcial row,i upon' storing spring of the calling device.

which engagement the pawl is rotated and the arm 139 is moved out of en agement with the ratchet teeth 128, rI-his fiees the shaft 16 from the control of spool126 so that the shaft 16 is free to rotate to return to its nor-.

mal position under the influence of the re- Upon this return-to-normal movement, the calling device 42 transmits a number of impulses corresponding to the pin operated or to the digit key depressed for the first digi-t of the telephone number.

Since the lever 26 is held down by the lpckingtof the Start key in its operated posi-` t1on, the arm 23 will not engage the portion 28 of the lever 26 and the shaft 16 and spider Wheel will be 'allo/wed to rotate through their normal positions to cause the arm 20 to again engage the end 125 of the pawl 121 to again free the spool 112 to place it under control of the spool 126. The same cycle of opera-y tion will again be completed, namely: the elevation of the pin board one step to place the second arcial row of pins in the path of the pin-engaging arm 138, the moving of the pawl 133 to place arm 139 in engagement with the ratchet teeth 128 to rotate the shaft 16, the rotating of the'pawl 133 in the opposite direction by the engagement of the pin-engaging arm 138 and the operated pin in the second arcial row to free the shaft 16 to allow the shaft 16 to return to normal and the calling device to transmit the number of impulses corresponding to the pin engaged by theuarm138 or corresponding to the digit key pressed in accordance with the second digit of the telephone number.

This cycle of operations is performed for each digit of the telephone number. When series of impulses corresponding to all digits of the telephone number have been transmitted, there will be no operated pin in the path of the pin-engaging arm 138, so the pin-- engaging arm will be moved until it engages the stop pin 144. This movement of the shaft 16 causes the gear segment 103 to engage the arm 73 of the double-armed pawl and move the arm 73 to free the end 72 of the start key, thereby allowing the springs 77 and 78 tovseparate .to `open the motor circuit, and the spring 78 to restore the start key to itsnormal position.

Simultaneous with the opening of the ino-4 tor circuit andthe return-to-normal of the start key, the 'arm 22 of the spider wheel operates the ber# member 24 to move the contact spring 31 into engagement with con# .tact spring 30 to place a shunt about the impulse springs lof the calling device to tplil'cvent transmls'sion of impulses upon the al return-tonormal movement o f the shaft 16 and consequently the callingvdevice 42, and

the arm 23 of the spider wheel operates the y When the shaft 16 is rotated far enough for the arm to engage the stop pin 144:, the piece 105 carried by the gear segment 103 passes the end 107 of spring 106 a very slight distance so that when the shaft 16'is released from the control of spool 126 its return-tonormal movement will be prevented by the engagement of the piece 105 with the end 107 of spring 106 until the pin board has dropped to its normal position to move the spring 106 to release the shaft 16 by the operation of the lever comprising arms 109 and 108.

The shaft 16 in returning to normal, through the medium ofthe shoulder 18 of the collar 18 and the lifting lever 146 raises the lever 87 to perform the pin restoring operation. Since the start key has returned to its normal position and returned the lever 26 to its normal position, the arm 23 of the spider wheel will engage the portion 28 of the lever 26 and the spider wheel and shaft 16 will be stopped in their normal positions. The sender is now in readiness for the transmission of other series of impulses corresponding to the digits of a second telephone number.

Although I have chosen the foregoing application of my invention as a disclosure thereof, it is not my intention to be limited to the exact disclosure since there are undoubtedly modifications and other applications which could be made by those skilled in the. art without departing from the spirit of the invention.

Having thus described my invention, what I consider new and desire to have protected by Letters Patent is pointed out in the appended claims.

What is claimed is:

1. In an impulse sender, impulse generating means having a normal position, an electric motor, means controlled by the motor for operating said generating means from its normal position, a plurality of digit keys, means operated by the operation of a plurality of said keys for manipulating said motor controlled means to cause it to operate said generating means from its normal "position a number of times corresponding to the number of said keys operated, and means for returning said generating meansto its `normal position after each oH-normal operation to thereby generate series of impulses corresponding to the digits represented by the operated keys.

2. In an impulse sender, impulsegenerating means, an electric motor, means controlled by said motor for operating said generating means, a plurality of digit keys, and a pin board having a plurality of rows of pins, one pin in each row for each key, successive operations of a plurality of said keys moving one pin in each row Vto an operated position for manipulating said motor controlled means to cause that means to operate said generating means a number of times corresponding to the number of pins operated to generate serles of lmpulses corresponding to v`the digits represented by the operated keys.

3. In an impulse sender, a row of pins having operated positions, a plurality of digit keys operable to move 'said pins to their operated positions, one key for each pin, an impulse generator, an electric motor, and a pawl and ratchet arrangement operated by said motor and manipulated by an operated one of said pins for operating said impulse generator to generate a series of impulses corresponding to the digit key associated with said operated pin.

4.7111 an impulse sender, a pin board having a plurality of rows of pins, a plurality of digit keys normally in operative relation with one of said rows and operable to move the pins of that. row to operated positions, there being one key for each pin in 'a row, means operated by the operation of any one of said keys for elevating said pin board to place another row of'pins in operative relation with said keys, an impulse generator, an electric motor, and a, awl and ratchet arrangement operated Ifly said motor and manipulated by the operated ones of said pins for operating said generator a number of times corresponding to the number of keys operated to generate series of impulses corresponding-to the digits represented by the operated digit keys.

5. In an impulse sender, a pin board having a pluralityof rows of pins, a plurality of digit keys normally in operative relation with one of said rows and operable to move the pins of said row to operated positions, there being one key for each pin in a row, means operated by the operation of any one of said keys for elevating said pin board to place another row of pins in operative relation with said keys, an impulse generator, an electric motor having circuit closing springs, means for operating said springs to close the circuit of said motor to start the voperation thereof and for restoring the elevated pin board, a pawl and ratchet arrangement operated by said motor and manipulated by the operated pins one at a time to operate said impulse generator a number of times to generate with each operation aI series of impulses corresponding to the digit key associated with the manipulating pin, and means automatically operated after each manipulation of said pawl'and ratchet arrangement for operating said elevating .means to elevate the pin board to place the operated pin of the succeeding row in position to manipulate said arrangement.

6. In an impulse sender, an impulse generator having a normal position, an electric motor, a shaft geared to said generator, a ratchet wheel rotatably mounted on said shaft and rotated by said motor, a pawl cartion, a digit key, means operated by said tid titi

digit key for operating said pawl out of engagement with said ratchet wheel to stop the operation of said shaft, and means for .thereafter returning said generator to its normal position to therebygenerate a series of impulses corresponding to the digit represented y'said key.

-7. In an impulse sender, an impulse generator having a normal position, a rotatable 'shaft geared to said generator, means for.

rotating said shaft to move said generator from' its normal position, means for controlling the extent of rotation of said shaft, and means for returning said generator to its normal position to thereby transmit a series of impulses indicative of the extent of rotation of said shaft.

8. In an impulse sender, an impulse generator having a normal position, a rotatable shaft geared to said genepator, means for rotating said shaft a plurality of times to move said generator from its normal position a corresponding number of times, means for varying the extentof each of said rotations, and means forl returning said generator to its normal position after each off-normal movement thereof to generate series oi impulses varying in number directly with the variations in extent of said rotations.

9. In an impulse transmitter, a constantly moving element, an impulse generator, a spring for operating said generator to trans- Amit varying numbers of impulses, means for connecting said generator with the constantly moving element for variable periods of time to store lenergy in said spring, and keys for controlling the time of such connections, said spring operating the generator to transmit a number of impulses varying in accordance `with the key operated. r

10. In an impulse transmitter a constantly moving element, animpulse generator having a normal position, a spring for operatin said generator to transmit varying num ers of impulses, meansfor connecting said generator with the constantly moving element to move said generator from its normal position to store energy in said Asprlng, and keys for varying the extent of said offnormal movement, said spring operating the generator at the termination of saidonormal movement to transmit a number of 1mpulses varying in accordance with the key operated.

' 11. In an impulse sender, an impulse generator having a normal position, Ameans for operating said generatorv from itspnormal position, a plurality of digit keys, meansV operated bythe operation of a plurality of said keysfor manipulating said first means Ato cause it to operate said generator a number of times from its normal position corresponding to the number of the keys operated, and means for returning said generator to its normal position after each off-normalA operation to thereby generate series of impulses corresponding .to the digits represented by the operated keys.

12. In an impulse sender, an impulse generator, means for operating said generator, a row of pins, and a digit key foreach of said pins and operable to move the associated pin to an operated position for lcontrolling said means to cause said generator to generate a number of impulses corresponding to the Jdigit represented by that key.

13. In combination, an impulse generator having a normal position, means including an electric motor for moving said generator from its normal position varying distances, and means for returning said generator to its normal position to thereby generate numbers of impulses varying in accordance with the distance of the off-normal movement.

14. `In combination, an impulse generator having a normal position, means for moving said generator from its normal position, means including keys and manipulated by the operation of one of said keys for controlling the off-normal movement, and means for returning said generator to its normal position to thereby generate a number of impulses indicative of the key operated.

15. in combination, an impulse generator adapted to return to a normal position under its own power after being moved from its normal position and to generate impulses varying in number according to the extent of the oi-normal movement, and mea-ns operated by an electric motor and controlled by keys for moving said generator lvarying -distances from its normal position.

16. In combination, an impulse generator having a normal position, means operated by` an electric motor and controlled by keys for moving said generator varying distances from its vnormal position, and means for returning said generator to its normal position after each off-normal movement but in the reverse direction to thereby .transmit impulses varying in number according to. the extent of the off-normal movement.

17. In combination, al rotatable impulse generator having a normalposition, means operated by an electric motor and controlled by keys for rotating said generator variable distances from its normal position, and means for rotating said generator inV the reverse direction back to its normal position after each olf-normal rotation to thereby transmit impulses varying in number according to the extent of the off-normal rotation.

18. In combination, an impulse generatorhaving a normal and an extreme position,

lli

means for moving said generator varying distancesy from its normal position, means for returning said generator to its normal position to thereby generate impulses. varying in number in accordance with the extent of the off-normal movement, and means effective Whenever said generator is moved to its extreme position to render said generator ineffective to generate impulses on the return to normal therefrom.

19. The combination of an impulse generator adapted to return to a normal position under its own power after being moved therefrom and having a pair of impulse springs operated during each return to normal movement. to generate impulses varying in number according to the extent of the off-normal movement, said generator also having au extreme position, means operated by an electric motor `and controlled by keys for moving'said generator varying distances from its normal position, and means effective Whenever said generator is moved to its extreme position to short circuit said springs to render them ineffective to generate impulses during the returnto normal of said generator from its eXtreme position.`

20. In an impulse sender, a pin-board having a plurality of rows of pins, a plurality of digit keys normally in operative relation with the pins of one of said rows and operable to move the pins of that row to operated positions, there being one key for each pin in a row, means operated by the operation of any. one of said keys for moving said pin-board to place another row of pins in operative relation with said keys, an impulse generator, an electric motor, a pawl and ratchet arrangement operated b said motor and manipulated by the operate ones of said pins for operating said generator a number of times corresponding to the number of keys operated to generate a corresponding number of series of impulses corresponding to the digits represented by the operated digit keys, and means effective after said generator has been operated said corrsponding number of times to restore the operated ones of said pms.

In Witness whereof, I hereunto subscribe my name this 28th day of January, A. D.

HANS SENGEBUSCH. 

